Spin down of the core rotation in red giants

  title={Spin down of the core rotation in red giants},
  author={Beno{\^i}t Mosser and M-J. Goupil and K. Belkacem and Jo{\~a}o Pedro Marques and Paul G. Beck and Steven Bloemen and Joris De Ridder and Caroline Barban and S{\'e}bastien Deheuvels and Yvonne P. Elsworth and Saskia Hekker and Thomas Kallinger and R-M. Ouazzani and Marc H. Pinsonneault and R'eza Samadi and Dennis Stello and R. A. Garc{\'i}a and Todd C. Klaus and J. Li and Savita Mathur and Robert L. Morris},
  journal={Astronomy and Astrophysics},
Context. The space mission Kepler provides us with long and uninterrupted photometric time series of red giants. We are now able to probe the rotational behaviour in their deep interiors using the observations of mixed modes. Aims. We aim to measure the rotational splittings in red giants and to derive scaling relations for rotation related to seismic and fundamental stellar parameters. Methods. We have developed a dedicated method for automated measurements of the rotational splittings in a… 

Rapidly rotating red giants

Stellar oscillations give seismic information on the internal properties of stars. Red giants are targets of interest since they present mixed modes, wich behave as pressure modes in the convective

Core rotation braking on the red giant branch for various mass ranges

Context. Asteroseismology allows us to probe stellar interiors. In the case of red giant stars, conditions in the stellar interior are such as to allow for the existence of mixed modes, consisting in

Measuring the core rotation of red giant stars

Red giant stars present mixed modes, which behave as pressure modes in the convective envelope and as gravity modes in the radiative interior. This mixed character allows to probe the physical

Seismic constraints on the radial dependence of the internal rotation profiles of six Kepler subgiants and young red giants

Context. We still do not understand which physical mechanisms are responsible for the transport of angular momentum inside stars. The recent detection of mixed modes that contain the clear signature

Internal rotation of 13 low-mass low-luminosity red giants in the Kepler field.

The Kepler space telescope has provided time series of red giants of such unprecedented quality that a detailed asteroseismic analysis becomes possible. For a limited set of about a dozen red giants,


Core rotation rates have been measured for red giant stars using asteroseismology. These data, along with helioseismic measurements and open cluster spin-down studies, provide powerful clues about


We study the dynamics of the stellar interior of the early red-giant star KIC 4448777 by asteroseismic inversion of 14 splittings of the dipole mixed modes obtained from Kepler observations. In order

Seismic diagnostics for transport of angular momentum in stars. I. Rotational splittings from the pre-main sequence to the red-giant branch.

Context. Rotational splittings are currently measured for several main sequence stars and a large number of red giants with the space mission Kepler. This will provide stringent constraints on

Mixed modes in red giants: a window on stellar evolution

Context. The detection of oscillations with a mixed character in subgiants and red giants allows us to probe the physical conditions in their cores. Aims. With these mixed modes, we aim at

Period spacings in red giants; III. Coupling factors of mixed modes

The power of asteroseismology relies on the capability of global oscillations to infer the stellar structure. For evolved stars, we benefit from unique information directly carried out by mixed modes



Fast core rotation in red-giant stars as revealed by gravity-dominated mixed modes

An increasing rotation rate from the surface of the star to the stellar core in the interiors of red giants is reported using the rotational frequency splitting of recently detected ‘mixed modes’, which confirms the theoretical prediction of a steep gradient in the rotation profile towards the deep stellar interior.


Rotation is expected to have an important influence on the structure and the evolution of stars. However, the mechanisms of angular momentum transport in stars remain theoretically uncertain and very

Angular momentum transport in stellar interiors constrained by rotational splittings of mixed modes in red giants

Context. Recent asteroseismic observations have led to the determination of rotational frequency splittings for � = 1 mixed modes in red giants. Aims. We investigate how these observed splittings can

Probing populations of red giants in the galactic disk with CoRoT

The detection with CoRoT of solar-like oscillations in nearly 800 red giants in the first 150-days long observational run paves the way for detailed studies of populations of galactic-disk red

Mixed modes in red-giant stars observed with CoRoT

Context. The CoRoT mission has provided thousands of red-giant light curves. The analysis of their solar-like oscillations allows us to characterize their stellar properties. Aims. Up to now, the

Asteroseismology of red giants from the first four months of Kepler data: Fundamental stellar parameters

Context. Clear power excess in a frequency range typical for solar-type oscillations in red giants has been detected in more than 1000 stars, which have been observed during the first 138 days of the

Solar-like Oscillations in Low-luminosity Red Giants: First Results from Kepler

We have measured solar-like oscillations in red giants using time-series photometry from the first 34 days of science operations of the Kepler Mission. The light curves, obtained with 30 minute

Characterization of the power excess of solar-like oscillations in red giants with Kepler

Context. The space mission Kepler provides us with long and uninterrupted photometric time series of red giants. This allows us to examine their seismic global properties and to compare these with

Gravity modes as a way to distinguish between hydrogen- and helium-burning red giant stars

Observations of gravity-mode period spacings in red giants that permit a distinction between evolutionary stages to be made, using high-precision photometry obtained by the Kepler spacecraft to measure oscillations in several hundred red giants.

Testing Scaling Relations for Solar-like Oscillations from the Main Sequence to Red Giants Using Kepler Data

We have analyzed solar-like oscillations in ∼1700 stars observed by the Kepler Mission, spanning from the main sequence to the red clump. Using evolutionary models, we test asteroseismic scaling